Zylus sits next to 4 phonetic neighbors — Silas, Cyrus, and Zander are the closest matches by sound. Most share Zylus's Latin (via modern invention)-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"of the forest, wood dweller (via Silas)"
"son of Elijah"
"medieval local official, administrator"
"ox (original Phoenician root)"
"descendant of the hound of valor"
"of the birds, bird-like"
"harmony, concord"
"ocean person"
"slender, narrow"
"Romantically associated with the poet Lord Byron meaning noble and ..."
"great, supreme, exalted"
"modern invented elaboration of Ezra"
"immortal, deathless"
"great tide, sea wave"
"gift of God"
"son of the spear-ruler (Gerald = Geirald)"
"modern invented name"
"belonging to God"
"son of Brice; son of Bryce"
"Lukes town"
"anglicization of Welsh Llwyd"
Similar sound: These names share phonetic patterns with Zylus — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin (via modern invention) origins, giving them the same cultural heritage as Zylus.
Rhythm: Zylus is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.